code: def per_slot_reduce(self):
      return self.lm_losses, self.token_count, self.char_count
  
imports: import logging
  import os
  import numpy
  from attrdict import AttrMap
  from eval_tasks.eval_adapter import run_eval_harness
  from megatron.neox_arguments import NeoXArgs
  from torch.utils.tensorboard import SummaryWriter
  from determined.pytorch import MetricReducer, PyTorchCallback
label_desc: Use image node_id 4 for calling the LMReducers obj's underlying member method code with example usage: obj.per_slot_reduce() and returns: self,  self,  self